From Longman Dictionary of Contemporary Englishdefrostde‧frost /ˌdiːˈfrɒst $ -ˈfrɒːst/ verb1DF[intransitive, transitive] if frozenfooddefrosts, or if you defrost it, it gets warmer until it is not frozen → melt, thaw2DH[intransitive, transitive] if a freezer or refrigerator defrosts, or if you defrost it, it is turned off so that the iceinside it melts3[transitive] American EnglishTTC to remove ice from inside the windows of a car by using heat or warm air→ See Verb table